SAE J1079v001

SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.”SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions.QUESTIONS REGARDING THIS DOCUMENT: (724) 772-8512 FAX: (724) 776-0243TO PLACE A DOCUMENT ORDER; (724) 776-4970 FAX: (724) 776-0790SAE WEB ADDRESS http://www.sae.orgCopyright 1995 Society of Automotive Engineers, Inc.All rights reserved. Printed in U.S.A.SURFACEVEHICLE400 Commonwealth Drive, Warrendale, PA 15096-0001RECOMMENDEDPRACTICESubmitted for recognition as an American National StandardJ1079REAF.MAR95Issued 1974-08Reaffirmed 1995-03Superseding J1079 SEP88OVERCENTER CLUTCH SPIN TEST PROCEDUREForeword—This Reaffirmed Document has been changed only to reflect the new SAE Technical Boards Format.1. Scope—This SAE Recommended Practice applies to driving ring type overcenter clutches such as are usedin industrial power takeoffs.1.1 Purpose—This document is intended to provide a uniform test procedure for overcenter clutches to determineeither the rotative speed at which they will burst or a specified speed they will withstand without burst.2. References2.1 Applicable Publication—The following publication forms a part of the specification to the extent specifiedherein. Unless otherwise indicated the latest revision of SAE publications shall apply.2.1.1 SAE PUBLICATION—Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.SAE J1240—Flywheel Spin Test Procedure3. Test Equipment—Refer to SAE J1240 for a description of test equipment requirements.4. Test Procedure4.1 Prior to spin testing, the item to be tested is to be identified, checked for material and dimensional defects, andbalanced to print specification. Hardness readings should be recorded on all critical areas.4.2 Test should be performed in a minimum ambient temperature of 15 °C (60 °F). Record ambient temperature.4.3 Mountings—For items 4.3.2 through 4.3.5, use enough clamping force to hold the test piece in place on thefixture but not enough to counteract centrifugal force.4.3.1 CLUTCH ASSEMBLIES—Mount the clutch assembly on the test shaft in new clutch engaged or new clutchreleased position. Suitable spacers may be used to simulate a drive disc. The release bearing and bearingcarrier may be removed.4.3.2 PRESSURE PLATE OR MULTIPLE-PLATE CLUTCH INTERMEDIATE PLATE—Mount the specimen on a test fixturepiloting either by the same methods used in the clutch or by the ID.SAE J1079 Reaffirmed MAR95-2-4.3.3 DRIVE RING—Mount the drive ring on the test fixture piloting by the ID.4.3.4 DRIVE DISC (ONE PIECE)—Subject the drive disc to 260 °C ± 3 °C (500 °F ± 5 °F) for 15 min. Mount the drivedisc on the test fixture piloting by the ID. The maximum elapsed time between removal from the heatchamber and initial acceleration shall be 25 s. See 4.4.4.3.5 DRIVE RING AND SEGMENTED DRIVE DISC—Mount the drive ring on the test fixture piloting by the ID. Positionthe segmented drive disc or discs in the drive ring in the new clutch released position. Segments must bepositioned without clamping by the test fixtures so they remain in a plane perpendicular to the axis of rotationduring the test.4.4 Check and record part concentricity and runout as assembled on the spin test adapter. For drive discs to betested hot (4.3.4), measurements may be made before heating.4.5 After attaining 75% of predetermined minimal peripheral speed, accelerate at a peripheral rate not to exceed1.4 m/s2 (4.6 ft/s2) to a predetermined speed limit or until burst occurs.PREPARED BY THE SAE CLUTCH, FLYWHEEL, AND HOUSING STANDARDS COMMITTEESAE J1079 Reaffirmed MAR95Rationale—Not applicable.Relationship of SAE Standard to ISO Standard—Not applicable.Application—This SAE Recommended Practice applies to driving ring type overcenter clutches such as areused in industrial power takeoffs.Reference SectionSAE J1240—Flywheel Spin Test ProcedureDeveloped by the SAE Clutch, Flywheel, and Housing Standards Committee